ShapeArea.java

import java.util.Scanner;

public class ShapeArea {
	public static void main( String[] args ) {
		Scanner keyboard = new Scanner(System.in);
		int choice, square;
		double area = 0;
		
		System.out.print("Shape Area Calculator version 0.1");
		System.out.println(" (c) 2015 LJtHW Sample Output, Inc.");
		
		do {
			System.out.println("\n-=-=-=-=-=-=-=-=-=-=-=-=-=-=-\n");
			System.out.println("1) Triangle");
			System.out.println("2) Circle");
			System.out.println("3) Rectangle");
			System.out.println("4) Square");
			System.out.println("5) Quit");
			System.out.print("> ");
			choice = keyboard.nextInt();
			
			if ( choice == 1) {
				System.out.print("\nBase: ");
				int b = keyboard.nextInt();
				System.out.print("Height:");
				int h = keyboard.nextInt();
				area = computeTriangleArea(b, h);
				System.out.println("The area is " + area);
			}
			else if (choice == 2) {
				System.out.print("\nRadius: ");
				int radius = keyboard.nextInt();
				area = computeCircleArea(radius);
				System.out.println("The area is " + area);
			}
			else if (choice == 3 ) {
				System.out.print("\nLength: " );
				int q = keyboard.nextInt();
				System.out.print("Width: ");
				int w = keyboard.nextInt();
				System.out.println("The area is " + computeRectangleArea (q, w) );
			}
			else if (choice == 4) {
				System.out.print("\nSide Length: ");
				int side = keyboard.nextInt();
				square = computeSquareArea(side);
				System.out.println("The area is " + square);
			}
			else if (choice != 5) {
				System.out.println("ERROR.");
			}
			
		} while (choice != 5 );
		
	}
	
	public static double computeTriangleArea( int base, int height) {
		double A;
		A = 0.5 * base * height;
		return A;
	}
	
	public static double computeCircleArea (int radius) {
		double A;
		A = Math.PI * radius * radius;
		return A;
	}
	
	public static int computeRectangleArea( int length, int width ) {
		return (length * width);
	}
	
	public static int computeSquareArea( int side) {
		int A;
		A = side * side;
		return A;
	}
}